Models for predicting temperature dependence of material properties of aluminum

Marla, Deepak; Bhandarkar, Upendra; Joshi, Suhas S.

doi:10.1088/0022-3727/47/10/105306

Cited by 26 publications

(16 citation statements)

References 55 publications

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“…The present study provides improved accuracy for the ac- In recent years, the interaction between the material ablated from the surface and the laser has been investigated in detail, which demonstrates the importance of accurately modelling the temperature dependence of key physical properties, [29,48,90], an aspect that has been strongly emphasised in this paper. The behaviour of the subsurface during ablation has not been heavily studied due to the difficulty of measuring the microstructure inside the material and relating it to the processes that created it.…”

Section: Tetrahedral Amorphous Carbonmentioning

confidence: 85%

“…In contrast, ta-C is an amorphous diamond like carbon having a low diffusivity and high absorption coefficient at the laser wavelength used during the experimental tests (248 nm) [33]. Previous studies show that the temperature dependence of the material properties (thermal and optical) has a strong influence on the predictions of models for nanosecond pulsed laser ablation [48]. Thus, it is critical for the accuracy of the model results to employ material properties as close as possible to the real ones.…”

Section: Methodology For Materials Properties Used In the Simulationmentioning

confidence: 99%

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A study of surface swelling caused by graphitisation during pulsed laser ablation of carbon allotrope with high content of sp³bounds

Cadot¹,

Billingham²,

Axinte³

2017

J. Phys. D: Appl. Phys.

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Experiments and theory are employed to investigate the laser ablation of boron doped diamond and tetrahedral amorphous carbon using nanosecond pulses. For a single pulse at low values of fluence, the laser induces a swelling of the surface due to graphitisation, whilst a high level of fluence leads to recession of the surface due to vaporization.To understand and investigate the underlying phenomena during the diamond-laser interaction, a model has been developed to reliably and quickly predict the behaviour of the surface and the thickness of the heat affected zone. The model is based on conservation of heat and mass during the laser-workpiece interaction. It consists of a one-dimensional system of non-linear equations that models the material heating, evaporation, graphitisation and plasma shielding. There is excellent agreement between numerical and experimental results for the position of the interfaces up to a high laser fluence. This model is the first to investigate the ablation of diamond that is able to capture surface swelling due to the graphitisation of the diamond layer, the graphite thickness and the amount of ablated material within a single framework. Furthermore, the model provides a novel methodology to investigate the thermal stability of diamond-like carbon films. The activation energy for tetrahedral amorphous carbon is obtained using the model with an accuracy of 3.15 +1.0 −0.22 eV.

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Section: Tetrahedral Amorphous Carbonmentioning

confidence: 85%

Section: Methodology For Materials Properties Used In the Simulationmentioning

confidence: 99%

A study of surface swelling caused by graphitisation during pulsed laser ablation of carbon allotrope with high content of sp³bounds

Cadot¹,

Billingham²,

Axinte³

2017

J. Phys. D: Appl. Phys.

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“…На спектральной зависимости мнимой части диэлектрической проницаемости ε 2 (E) проявляется полоса с локальным максимумом в области 1.5 eV, форма которой отличается от лоренцевской [7], связанная с межзонным поглощением [8,9]. В [2,10] предложено использовать модель критических точек для описания опти-ческих констант алюминия, но аппроксимация выполнена только в види-мой области без анализа влияния температуры [10]. Возрастание ε 2 при уменьшении E в области менее 1 eV связано не только с внутризонным поглощением света, но и со слабой полосой межзонного поглощения с максимумом в районе 0.5 eV.…”

Section: поступило в редакцию 27 декабря 2016 гunclassified

“…DOI: 10.21883/PJTF.2017.11.44699.16642 Исследование влияния температуры на оптические свойства метал-лов и состоящих из них наночастиц является важной практической задачей. При получении наночастиц методом абляции металлов [1] температурная зависимость коэффициента отражения приводит к кор-рекции значения критической плотности энергии импульса [2]. Измене-ние оптических свойств пленки молибдена при лазерном воздействии вызывает уменьшение зоны абляции [3,4].…”

unclassified

Температурные Зависимости Оптических Свойств Наночастиц Алюминия

Каленский¹,

Звеков²

2017

Письма В Журнал Технической Физики

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Проведен анализ спектральных зависимостей оптических свойств алюминия при различных температурах. Предложены и апробированы аппроксимирующие выражения для мнимой части диэлектрической проницаемости. Выполнен расчет коэффициента отражения при нормальном падении света и оптических свойств наночастиц с радиусом 150 nm в температурном интервале 298−933 K для практически важных длин волн. Показано, что для алюминия наблюдается нетипичное поведение оптических свойств: повышение коэффициента отраже-ния и уменьшение коэффициента эффективности поглощения наночастиц при росте температуры, что связано с вкладом межзонных переходов в оптические свойства алюминия. DOI: 10.21883/PJTF.2017.11.44699.16642 Исследование влияния температуры на оптические свойства метал-лов и состоящих из них наночастиц является важной практической задачей. При получении наночастиц методом абляции металлов [1] температурная зависимость коэффициента отражения приводит к кор-рекции значения критической плотности энергии импульса [2]. Измене-ние оптических свойств пленки молибдена при лазерном воздействии вызывает уменьшение зоны абляции [3,4]. В [5] показано, что рост температуры приводит к повышению коэффициента эффективности поглощения наночастиц серебра на длине волны основной гармоники неодимового лазера, что может вызывать нелинейные оптические эффекты в поле лазерного излучения. Данные эффекты необходимо учитывать при структурировании материалов лазерным излучением [6]. В то же время экспериментальное исследование данных зависимостей представляет собой нетривиальную задачу и для большинства металлов 72

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“…Figure 2 shows temperature dependences of thermophysical λ(T), L v (T), C p (T) and optical R(T), κ L (T) characteristics of aluminum. The curves were L v (T) and C p (T) obtained from molecular dynamics calculations, and λ(T), κ L (T), and R(T) were constructed on the basis of theoretical concepts [92][93][94] and reference data [95][96][97].…”

mentioning

confidence: 99%

Nanosecond Laser Ablation: Mathematical Models, Computational Algorithms, Modeling

Mazhukin¹

2017

Laser Ablation - From Fundamentals to Applications

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The basic mathematical models, computational algorithms, and results of mathematical modeling of various modes of laser action on metals are considered. It is shown that for mathematical description and analysis of the processes of laser heating, melting, and evaporation of condensed media, various theoretical approaches are used: continuum, kinetic, atomistic, etc. Each of them has its own field of applicability, its advantages, and disadvantages. Mathematical description of ns-laser ablation is usually carried out within the framework of continuum approach in the form of hydrodynamic models that take into account reaction of irradiated material to varying density, pressure, and energy both in the target and in the vapor-gas medium. Within the framework of continuum approach, a multiphase, multifront hydrodynamic model and computational algorithm were constructed that were designed for modeling ns-PLA of metal targets embedded in gaseous media. It is shown that proposed model and computational algorithm allow to carry out the simulation of interrelated mechanisms of heterogeneous and homogeneous evaporation of metals manifested as a series of explosive boiling. Modeling has shown that explosive boiling in metals occurs due to the presence of a near-surface temperature maximum. It has been established that in ns-PLA, exposure regimes can be realized in which a phase explosion is the main mechanism of material removal. The verification of reliability of obtained results was carried out by comparing experimental data and calculations with atomistic models.

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Models for predicting temperature dependence of material properties of aluminum

Cited by 26 publications

References 55 publications

A study of surface swelling caused by graphitisation during pulsed laser ablation of carbon allotrope with high content of sp³bounds

A study of surface swelling caused by graphitisation during pulsed laser ablation of carbon allotrope with high content of sp³bounds

Температурные Зависимости Оптических Свойств Наночастиц Алюминия

Nanosecond Laser Ablation: Mathematical Models, Computational Algorithms, Modeling

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Models for predicting temperature dependence of material properties of aluminum

Cited by 26 publications

References 55 publications

A study of surface swelling caused by graphitisation during pulsed laser ablation of carbon allotrope with high content of sp3bounds

A study of surface swelling caused by graphitisation during pulsed laser ablation of carbon allotrope with high content of sp3bounds

Температурные Зависимости Оптических Свойств Наночастиц Алюминия

Nanosecond Laser Ablation: Mathematical Models, Computational Algorithms, Modeling

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A study of surface swelling caused by graphitisation during pulsed laser ablation of carbon allotrope with high content of sp³bounds

A study of surface swelling caused by graphitisation during pulsed laser ablation of carbon allotrope with high content of sp³bounds